ulna(redirected from ulnas)
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upper limb in humans. Three long bones form the framework of the arm: the humerus of the upper arm, and the radius (outer bone) and ulna (inner bone) of the forearm.
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The larger of the two bones of the forearm or forelimb in vertebrates; articulates proximally with the humerus and radius and distally with the radius.
1. the inner and longer of the two bones of the human forearm
2. the corresponding bone in other vertebrates